Remote host control software

[andrew.p.shay]

Does anyone know of any free (preferably open source Python) software that will allow me to remotely control host machines (Windows, Linux and Mac)? I need to be able to send/receive files and execute commands.

I need it to be as fast as possible. I need the host machines to be connected to via IP and they need to accept connections from any other machine, ie there can't be some central server that they connect to, and accept commands from.

I don't mind rolling my own solution, but I'd like to find something if it already exists.

[McDave]

Could use the SSH to connect into Linux and Mac allowing you to issue cli directly to the OS. Windows does not do this natively so you could install Cygwin to enable it there

[binaryzero]

Teamviewer. 

LOL @ python.